On 23.03.2018 20:50, Jochen Strohbeck wrote:
[..]
I am able to reproduce the same problem using curl on windows and found
out that even a PUT request with only a single byte payload takes about
a second! If I do the same request with python it takes some
milliseconds. Why?

I guess the problem is not directly related to lwip but I do not have
any clue where the problem is located.

I put the wireshark output below. First is the output of the curl
request, second the same request using python.

Any ideas ?

Yes: send a pcap, not some text. From the text output you sent, it seems obvious that the 1st version delays packets. Without having a look at the packet details, it's hard to tell why.

Simon

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